Water-signal switch



K. V. KNAPP WATER SIGNAL swI'rcH Aug. 2o, 1929.

Filed May 1, 1926 N QN wm mm,

QN: QN Qm\ QN\ x MN vw [9N V ATTORNEY Patented Aug. 20, 1929.

UNITED STATES 1,725,358 YPATENT OFFICE.

KENNETH V. KNAPP, OF NEWARK, NEW JERSEY, ASSIGNOR TO HANOVIA CHEMICAL & MFG. CO., F NEWARK, NEW JERSEY, A CORPORATION OF NEW JERSEY.

WATER-SIGNAL SWITCH.

Application filed May 1, 1926. Serial No. 105,933.

This invention relates to pressure controlled audible signals and more particularly to electrically actuated types.

There are certain classes of scientific, and

medical apparatus in which the accession of heat, internally generated or conducted thereto, is detrimental to their accurate opera-tion or even destructive if the temperature becomes excessive and in such cases it is usual to maintain a substantially uniform temperature by employing pipes supplied with cold water and so coiled or otherwise arranged as to absorb and carry away the excess heat.

Such devices, in order to fulfill their funetions, must be constantly watched or thermostatically calibrated by a careful and competent operator, particularly if fluctuations of heat occur vto which such apparatus is usually subject.

As an ex-ample may be mentioned therapeutical lamps as used in the production of florescent rays, the behavior of which and likewise safety, depend upon maintaining an equable temperature.

It is therefore an object of the invention to provide an alarm or signalling device, the operation of which is automatically controlled bychanges in the temperature and pressure of the fluid fiowing through the cooling coils.

A further feature is in the provision ofa neat appearing, compact signal device, simple in its nature, adjustable to requirements and effective in operation.

Other features and advantages will hereafter appear in the description taken in connection y with the drawing, constituting a component hereof, and in which Figure V1 is a plan View of an embodiment ofthe invention as fully assembled, the cover being omitted.

Figure 2 is a. longitudinal sectional view taken on line 2-2 of Fig. 1.

Figure 3 is a diagrannnatical view of the Wiring, Water supply and signal system.

The signalling device consists of a base plate designated by the numeral 1() disposable in any convenient location, preferably in an upright position as shown.

Fixed on the base to extend at a right angle is a shelf 11 and a longitudinal wall 12 divides the front of the base into nearly equal portions above the shelf, these elements supporting a metal cover 13 which encloses the structural parts in the manner of a box, its side and end wall reaching to the base.

Passing through the shelf 11 are two pipes 1st and 15, respectively inlet and outlet, the pipe 14 leading from the water cooling circulatory system employed and the pipe 15 to Wherever the water may be discharged.

These pipes extend in parallel to engage bosses on the opposite ends of a hollow casing 16 to communicate with the chamber therein, the casing beingV supported by a block fixed on the basel() and in open communication with a thin metallic bellows 17 of considerable area` and diameter.

The bellows 17 is formed of metal having a. high co-eflicient of'elongation in the presence of heat and pressure, the walls of the bellows presenting a series of accordion-like annular' undulations which permit ready and instant change in the length of the bellows being extremely sensitive to internal prersure The bellows is sealed to the casing 1G in a leak proof manner and is provided at its outer end with a plate closure 18.

A pair of bosses 19 extend opposite the pipe receiving bosses and fixed thereinv are rods 20 having shouldered portions passing through a dielectric plate 21 to hold the same in fixed relation to the casing 16.

Carried by the plate 21 are stop screws 22 to limit the outward movement or expansion of the bellows 17 and an opening 223 in the plate provides access to the head of a screw 24- passing adjustahly through a non-cons ducting bar 25 having on its face adjacent the bellows an elongated metal contact strip 26.

A pair of shouldered studs 27 and 28 are fixed in the plate 21, the stud 28 having a washer 3() disposed on the outer side of the contact strip 26 and held by a clamp screw thereagainst.

The stud 27 is provided with a Washer 29 and normally is engaged by the free end of the spring contact strip 26, the contact being broken upon elongation of the bellows 17 in an obvious manner.

A battery 31 is disposed on the base 10 at the opposite side of the partition wall 12 and provided with terminal binding posts 32 and 33. A conductor 34 connects between the post 32 and stud or binding post 28, and a similar conductor 35 eventually engages the mating stud 27.

Disposed in the run of the conductor 35 is a buzzer, .designated generally by the numeral 36 as an entity, being Voit common and well known construction.

Also in the line is a push-pull switch v37 controlling the circuit, the switch being supported by a bracket 38 connected over the buzzer trame and to the shelf 11, and having a manually actuated control knob 39 ex-A tending outward through an opening 40 in the cover plate 13 convenient of access.

l It it be desired an incandescent bulb 41 may be provided iii the line 35, or to a shunt thereof, thus affording a visible signal in addition to or independent of the audiblesignal.

In operation, a stream of water suppliedV from an convenient source is caused to circulate tiroughV suitable connections in the apparatus X to be cooled, thence conducted to the pipe 14 by which the water, raised in temperature, passes outV of the openelbow 14 thiough the chamber 16, transmitting its pressure and some of its heat to the bellows 17, causing it to expand, and thence delivered outwardly to any convenientv place for Y disposal by the pipe 15, the latter having a contracted inner end 15. Y A,

When the bellows 17 is expanded to increase its length to such an extent as to press its free end against the point of the screw 24, the plate and spring contact strip 26 is moved to break contact with the post 27, and, it the switch 37 be properly adjusted,

the signals will not operate until the bellows i has contracted.

The foregoing disclosure is to be regarded as descriptive and illustrative only, and not as restrictive or limitative of the invention,

of which obviously an embodiment may be with the other post a non-conductin@a blockV carried by said arm, a screw adjustable in said block to be engaged by the end of said bellows upon expansion thereof whereby said arm is disengaged from the last named post. i 2. fin automatic signal system embodying a ydetachable casing supported by an elongated base plate having a transverse shelf cooperwith a longitudinal disposed wall dividing said casina into contiguous compartments, said shelf being provided with a pa- Y rallel disposed inlet and outlet pipes said pipes being provided with enlarged communicating bosses, a block carried by the base plate, a liquid casing supported by the block and communicating with said bosses,

an open bellows operatively associated with'` said liquid casing, a pair oi" shouldered rods having a lower terminal boss supported by the liquid casing, a dielectric plate detachably supportedl on said shouldered rods, means carried by the dielectric plate for limiting movenientrot said bellows, a nonconducting bar having an elongated metal strip secured to said limiting means and coinplemental shoulder studs depending i'roin the dielectric member and being provided with contact washers.

3. ln a signalY switch embodying a detachable casing provided with a base plate, a pair or" spaced pipes adapted for transmission ot liquid, a block secured to said base plate, a container for liquid supported by the block and communicating with said pipes, a bellows carried by said liquid `casing, and means associated with said bellows for actuating the control of the` signal switch.

This specication signed this l27th day of March, 1926. i 'f KENNETH v. KNAPP.

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